The Audi A4 is a mid-size vehicle class D, produced by the German automaker Audi since November 1994 and is currently in the 4-generation. The first generation A4 replaced the Audi 80 in 1994.
In total they have released four generations Audi A4, all based on a series of generations' platform B "group Volkswagen Group, better known by its code:
Audi A4 B5 (1994-2001)
Audi A4 B6 (2000-2004)
Audi A4 B7 (2004-2008)
Audi A4 B8 (2007-present)